<template>
<view >
	<my-search @click="gotoSearch"></my-search>
	<view class="cate-contain">
		
		<!-- 左侧的滚动视图区域 -->
		<scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
			<block v-for="(item,i) in cateList" :key="i">
				<view :class="['left-scroll-view-item',i==active?'active':'']" @click="activeChange(i)">
					{{item.cat_name}}
				</view>
			</block>
		</scroll-view>
		<!-- 右侧的滚动视图区域 -->
		<scroll-view class="right-scroll-view" scroll-y :scroll-top="scrollTop" :style="{height: wh + 'px'}">
			<view class="cata-lv2" v-for="(item2,i) in cateLevel2" :key="i">
				<!-- 二级分类标题 -->
				<view class="cate-lv2-title">
					/{{item2.cat_name}}/
				</view>
				<!-- 当前二级分类下的三级分类列表 -->
				<view class="cate-lv3-list">
					<!-- 三级分类item项 -->
					<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="item3.cat_id" @click="gotoGoodsList(item3)">
						<!-- 图片 -->
						<image :src="item3.cat_icon"></image>
						<!-- 文本 -->
						<text>{{item3.cat_name}}</text>
					</view>
				</view>
			</view>
		</scroll-view>
	</view>
</view>
	
</template>

<script>
	export default {
		data() {
			return {
				wh: 0,
				//左侧分类数据列表
				cateList: [],
				//当前选中项的索引，默认让第一项被选中
				active: 0,
				//二级分类列表
				cateLevel2: [],
				// 滚动条距离顶部的距离
				scrollTop: 0



			};
		},
		methods: {
			async getCateList() {
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				// console.log(res)
				if (res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children


			},
			activeChange(i) {
				this.active = i
				// 为二级分类列表重新赋值
				this.cateLevel2 = this.cateList[i].children

				//让scrollTop 的值在0 1 之间切换
				this.scrollTop = this.scrollTop == 0 ? 1 : 0

			},
			gotoGoodsList(item3){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + item3.cat_id
				})
			},
			gotoSearch(){
				// console.log(333)
				uni.navigateTo({
				       url: '/subpkg/search/search'
				     })
			}
		},
		onLoad() {
			// 获取当前系统信息
			const sysInfo = uni.getSystemInfoSync()
			// console.log(sysInfo)
			//为 wh 窗口可用高度动态赋值
			this.wh = sysInfo.windowHeight-50

			//调用获取分类列表数据的方法
			this.getCateList()

		}

	}
</script>

<style lang="scss">
	.cate-contain {
		display: flex;

		.left-scroll-view {
			width: 120px;

			.left-scroll-view-item {
				line-height: 60px;
				background-color: #f7f7f7;
				text-align: center;
				font-size: 12px;

				// 激活项的样式
				&.active {
					background-color: #ffffff;
					position: relative;

					// 渲染激活项左侧的红色指示边线
					&::before {
						content: ' ';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #c00000;
						position: absolute;
						left: 0;
						top: 50%;
						transform: translateY(-50%);
					}
				}

			}
		}

		.right-scroll-view {
			.cate-lv2-title {
				font-size: 12px;
				font-weight: bold;
				text-align: center;
				padding: 15px 0;
			}

			.cate-lv3-list {
				display: flex;
			 flex-wrap: wrap;

				.cate-lv3-item {
					width: 33.33%;
					margin-bottom: 10px;
			  display: flex;
					flex-direction: column;
					align-items: center;

					image {
						width: 60px;
						height: 60px;
					}

					text {
						font-size: 12px;
					}
				}
			}
		}



	}
</style>
